I saw the name Ruth Esper mentioned in a Blog someone sent me. It mentions that she has bred a number of daylilies. I also found a listing for ADEODATUS (Esper 2012) in the AHS listing. Perhaps the blogger can help you find who you are looking for.

http://www.words4it.com/?tag=ruth-esper
This is the only reference I could find on line. I t does not sound like she has a garden center that sells plants. I would google the different varieties by her on the list above and try to find someone that sells her plants.